// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2015 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_CXX11_TENSOR_TENSOR_DIMENSION_LIST_H
#define EIGEN_CXX11_TENSOR_TENSOR_DIMENSION_LIST_H

namespace Eigen {

/** \internal
  *
  * \class TensorDimensionList
  * \ingroup CXX11_Tensor_Module
  *
  * \brief Special case of tensor index list used to list all the dimensions of a tensor of rank n.
  *
  * \sa Tensor
  */

template <typename Index, std::size_t Rank> struct DimensionList
{
    EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE const Index operator[](const Index i) const { return i; }
};

namespace internal {

    template <typename Index, std::size_t Rank> struct array_size<DimensionList<Index, Rank>>
    {
        static const size_t value = Rank;
    };
    template <typename Index, std::size_t Rank> struct array_size<const DimensionList<Index, Rank>>
    {
        static const size_t value = Rank;
    };

    template <DenseIndex n, typename Index, std::size_t Rank> const Index array_get(DimensionList<Index, Rank>&) { return n; }
    template <DenseIndex n, typename Index, std::size_t Rank> const Index array_get(const DimensionList<Index, Rank>&) { return n; }

#if EIGEN_HAS_CONSTEXPR
    template <typename Index, std::size_t Rank> struct index_known_statically_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex) { return true; }
    };
    template <typename Index, std::size_t Rank> struct index_known_statically_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex) { return true; }
    };

    template <typename Index, std::size_t Rank> struct all_indices_known_statically_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run() { return true; }
    };
    template <typename Index, std::size_t Rank> struct all_indices_known_statically_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run() { return true; }
    };

    template <typename Index, std::size_t Rank> struct indices_statically_known_to_increase_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run() { return true; }
    };
    template <typename Index, std::size_t Rank> struct indices_statically_known_to_increase_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run() { return true; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_eq_impl<DimensionList<Index, Rank>>
    {
        static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i == value; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_eq_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i == value; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_ne_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i != value; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_ne_impl<const DimensionList<Index, Rank>>
    {
        static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i != value; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_gt_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i > value; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_gt_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i > value; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_lt_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i < value; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_lt_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static constexpr bool run(const DenseIndex i, const DenseIndex value) { return i < value; }
    };

#else
    template <typename Index, std::size_t Rank> struct index_known_statically_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE bool run(const DenseIndex) { return true; }
    };
    template <typename Index, std::size_t Rank> struct index_known_statically_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE bool run(const DenseIndex) { return true; }
    };

    template <typename Index, std::size_t Rank> struct all_indices_known_statically_impl<DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE bool run() { return true; }
    };
    template <typename Index, std::size_t Rank> struct all_indices_known_statically_impl<const DimensionList<Index, Rank>>
    {
        EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE bool run() { return true; }
    };

    template <typename Index, std::size_t Rank> struct indices_statically_known_to_increase_impl<DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run() { return true; }
    };
    template <typename Index, std::size_t Rank> struct indices_statically_known_to_increase_impl<const DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run() { return true; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_eq_impl<DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_eq_impl<const DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_ne_impl<DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_ne_impl<const DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_gt_impl<DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_gt_impl<const DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };

    template <typename Index, std::size_t Rank> struct index_statically_lt_impl<DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };
    template <typename Index, std::size_t Rank> struct index_statically_lt_impl<const DimensionList<Index, Rank>>
    {
        static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE bool run(const DenseIndex, const DenseIndex) { return false; }
    };
#endif

}  // end namespace internal
}  // end namespace Eigen

#endif  // EIGEN_CXX11_TENSOR_TENSOR_DIMENSION_LIST_H
